So, Hume didn't stop ethical philosophers from trying to derive morals, he only stopped some of them. Wittgenstein and Borges didn't stop philosophers from trying to "beat" language games using only language: they only stopped some philosophers. I'm not saying that there aren't visionary heroes who realize that some discussions aren't going to go anywhere for fundamental reasons; instead, I'm highlighting the fact that even when they do, "all of philosophy" almost never reaches a consensus about quitting the debate. In math, when they deduced that the Axiom of Choice was always going to be an axiom, everybody quit looking for ways to confirm or refute it. I think it's a weakness of philosophy that similar things can't happen.